Grinding or crushing head.



v. w; MASON, JR. GRINDING 0R GRUSHING HEAD.

APPLICATION FILED JAN. 12, 1903.

PATENTED MAR. 14. 1905.

3 SHEETS-SHEET 1.

ll/z'irz essesx 1 hz/za- Z VW W N W PATENTED MAR. 14, 1905.

V. W. MASON, JR. GRINDING 0R GRUSHING HEAD.

APPLICATION FILED JAN. 12, 1903.

3 SHEETS-SHEET 2.

M'Znedaes: I

No. 784,581. v PATENTED MAR. 14, 1905.

V. W. MASON, JR.

GRINDING 0R GRUSHING HEAD.

APPLICATION FILED JAN.12, 1903.

3 SHEETS-SHEET 3.

Jflz'ineaae Zia/922502:

MM, 7?. Wm};

UNITED STATES Patented March 14, 1905.

PATENT OFFICE.

GRINDING OR ORUSHING HEAD.

SPECIFICATION forming part of Letters Patent N0. 784,581, dated March 14, 1905.

. Application filed January 12,1903. Serial No. 138,603-

0 (all w/wm it 7nr/, 7 concern:

Be it known that I, VOLNEY N. MAsoN, Jr., of New York, in the county and State of New York, have invented an Improvement in Grinding or Crushing Heads, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to grinding or crushing heads-such, for instance, as may be used in a gyratory crusher-and has for its object to simplify and improve the construction of the means employed for locking the external segmental plates to the core; and my invention is particularly applicable to grinding or crushing heads comprising, essentially, a core having thereon a plurality of manganese-steel segmental plates. On account of the wellknown difficulty of working manganese-Steel by machine it becomes impossible to employ ordinary or well-known forms of locking devices which could be employed if said segmental plates were made of ordinary steel.

The locking device herein to be described is normally concealed, yet can be readily in troduced or removed whenever desired, and its construction is such that it may be introduced without materially weakening the core or the plates, which is an important advantage.

The invention also has for its object to provide means for fitting the segmental plates, which are provided with dovetailed ribs on their rear faces, to a core which is formed with dovetailed grooves adapted to receive the ribs on the plates.

In practice it is practically impossible to so cast the segmental plates that the dovetailed ribs on their rear faces will snugly lit the dovetailed grooves in the core, and as a result the ribs on the plates must be ground to an approximate fit. On account of the weight of the plates and the difiiculty of handlingthem it is expensive to grind the ribs to thus lit the grooves. In accordance with this part of my invention a tapering gib is provided, which is inserted in each dovetailed groove in the core, being disposed at one side thereof and between one side wall of the groove and one side of the rib, and this gib, which is light and easily handled, will be ground to provide the required (it between the rib on the plate and groove in the core. These gibs may be employed in connection with a head wherein any kind of lockingdevicesare employed for locking the segmental plates to the core.

Figure 1 shows in vertical section a gymtory crusher having a head embodying this inven tion. Fig. 2 shows in side elevation the core to which the segmental plates are attached. Fig. 3 is a vertical section of the head, the

core being broken away to show one of the locking devices. Fig. l is an enlarged detail of a portion of one of the segmental plates, showing the locking device by which it is secured to the core. Fig. 5 is a horizontal sectional detail of a portion of a head, showing one of the segmental plates and the locking device. Fig. 6 is a perspective view of the lower end portion of one of the segmental plates, showing the transverse key-receiving recess and passage leading thereto for the introduction and removal of the keys. Fig. 7 is a sectional detail showing a modified form of locking device. Fig. 8 is a detail of a portion of the core, showing particularly the tapering shown in Fig. 8, taken on the dotted line 9 9,

with the segmental plate in position. Fig. 10 is a side elevation of a core of modilied construction. Fig. 11 is an enlarged detail of a portion of the core shown in Fig. 10 and the locking device applied thereto, and Fig. 12 is an enlarged detail of a portion of one of the segmental plates constructed to be used when employing the locking device shown in Fig.11.

The core a, heroin shown for the sake of illustrating my invention, is made conical and also hollow, yet-it may be made cylindrical or of any othersuitable shape and adapted to be mounted upon a spindle or shaft. The core a is formed or provided with a plurality' of like dovetailed grooves a, extending from one end to a point near the opposite end-as, for instance, from the bottom to a point near the topthe upper end of each groove forming an abutting shoulder near thetop of the core. These grooves are made tapering, being wider at the bottom than at the top. Near the lower end of each groove 6/ the core a is provided with two recesses a a which are located opposite each other and which extend at right angles to the groove, and said recesses are designed to receive the projecting ends of transversely-disposed keys which are employed for v the purpose of holding the segmental plates in place on the core, as will be described.

I) (see Fig. 4) represents one of the segmental plates, of which there will be any desired number, yet corresponding to the number of grooves a in the core. The segmental plates 6 are herein designed to be made of manganesesteel, yet they may be made of any other suitable material. The segmental plates 5 are made wider at the bottom than at the top to thereby adapt them to be placed upon the core, and they are made as long as the core and when placed thereon practically surround or inclose it. Each segmental plate I) is formed or provided on its inner side or face with a dovetailed rib Z), which extends from the bottom to a point near the top, to fit any one of the dovetailed grooves in the core. At a point near the bottom or lower end of each segmental plate a suitable support is formed or provided for a pair of oppositely-disposed keys 0 0. As herein shown, the key-support is formed by a recess 6 extending crosswise the dovetailed rib b and disposed opposite the key-receiving recesses in the core, so that when the segmental plate is placed in correct position on the core the keys 0 0. which occupy a position in the recess 5 will project into the key-receiving recesses 60 in the core. The dovetailed rib Z) is made tapering, being wider at the bottom than at the top. The segmental plates are driven onto the core in the direction of their length, the ribs 7) entering and snugly fitting the groove to and the upper ends of said ribs abutting against the shoulder at theupper ends of the grooves.

The keys 0 c are made as small blocks placed in alinement or disposed end to end in the recess 6 and are movable lengthwise in a direction away from each other to project more or less from the dovetailed rib 6 into the recesses (a in the core. The keys 0 0 are or may be slightly curved in the direction of their length to correspond to the curvature of the head,

although they need not necessarily be so curved. The keys 0 c are each preferably formed with one inclined side or face, and the recess 6, containing the keys, is likewise formed with inclined sides or faces, and said keys rest upon the inclined sides or faces of the recess, so that as said keys are moved lengthwise in a direction away from each other they will slide along on the bottoms of the supports provided for them.

An opening 0 is formed or provided through the lower part of the dovetailed rib I), beneath the transverse recess 6 which opens into said recess 6 and through this opening the keys 0 0 will be passed. The opening a willbe made large enough for the passage of the keys, as it is provided solely for this purpose, yet

it will be made as small as possible, so as not to materially weaken the segmental plate.

For the purpose of moving the keys 0 0 endwise in order that they shall project more or less from the dovetailed rib 5 into the recesses 60 in the core and also to hold said keys in their projected positions a screw 0 is tapped into the adjacent end of each key, and the heads of said screws are adapted to be brought into contact or engagement with each other and by such engagement the keys are thrust outward in a direction away from each other, as the screws are turned. It will be seen that as the keys are moved outwardly the segmental plate will be lifted slightly up against the shoulder at the top of the core, said keys thereby acting as wedges to produce this result. After the keys have been placed in their correct positions the space within the recess Z2 between the adjacent ends of the keys will he filled with any suitable material, as putty, for instance, and then the opening 0. will be filled with wood, zinc, or any other suitable material which may be easily removed whenever desired. By filling the space between the keys 0 c with putty the screws may be easily turned and the keys loosened for removal, when the Zinc is chipped out and the putty removed.

Referring to Fig. 7, the keys 0 0 are made smaller than the keys shown in Fig. 5 and in straight alinement and connected by a rightand-left screw, which latter can be operated to move the keys in opposite ways back and forth.

It will be seen that by the construction herein shown the passage for the introduction and removal of the keys is formed through the, thickest part of the segmental plate, and said plate is not materially weakened. Each segmental plate will be provided with an independent locking device of the character thus described.

Instead of forming the passages for the introduction and removal of the keys through the thickest part of the segmental plates said passages may be formed through the thickest parts of the score, as shown in Fig. 10, wherein it will be seen that the ribs or partitions between the grooves a are formed with the transverse key-receiving recesses a like the recesses 5 and with an opening (4 leading thereto, like the opening 0, and recesses 6 are formed in opposite sides of thedovetailed ribs b for the segmental plates, which receive the ends of the keys 0 0. This modification comprehends the essential feature of providing a passage for the introduction and removal of the keys in the thickest part of one of the essential members of the head.

In order to properly fit the tapering dovetailed rib b on the segmental plate to the tapering dovetailed groove a in the core without repeatedly grinding the rib, I havehere'in provlded a tapering or wedge-like gib g, which made of suitable dimensions to be introduced into and along one side of the tapering dovetailed groove, at the upper end thereof,

and which abuts against the upper end or shoulder of said groove, the wider end of said gib being placed uppermost, and the segmental plate is then driven onto the core. When the plate is thus driven onto the core, if it is found that the rib 6' does not properly fit the groove then said plate may be removed and the tapering gib, which may be easily handled, is removed and ground. Thus all the essential grinding required will be given to the gib instead of to the rib, as has usually been done. The gibs may and preferably will be made of ordinary steel, which is more easily worked than manganese steel of which the segmental plates are composed, which also tends to materially reduce the cost of fitting the parts together.

Having thus described my invention, what 1 claim as new, and desire to secure by Letters Patent, is-

1. A grinding or crushing head comprising a core having a plurality of longitudinal dovetailed grooves, a pluralityof segmental plates mounted on said core, each plate havinga longitudinal dovetailed rib projecting from its inner face, a locking device for each plate consisting of two transverse keys, disposed in alined apertures of said core and plate, and means interposed between their adjacent ends for holding them separated, substantially as described.

2. A grinding or crushing head comprising a core'having a plurality of longitudinal dovetailed grooves, a plurality of segmental plates mounted on said core, each plate havinga longitudinal dovetailed rib projecting from its inner face, a locking device for each plate consisting of two transverse keys disposed in alined apertures of said core and plate, and means interposed between their adjacent ends for adjusting them longitudinally and for holding them separated, substantially as described.

3. A grinding or crushing head comprising a core having apluralityoflongitudinal dovetailed grooves, a plurality of segmental plates mounted on the core, each having a longitudinal dovetailed rib projecting from its inner face, locking devices for said plates consisting of a plurality of keys, arranged in pairs, the keys of each pair being disposed end to end, in alined apertures of said core and plate, screws projecting from the adjacent ends of the keys of each pair, the heads of which are adapted to engage each other-,substantially as described.

4. A grinding or crushing head comprising a core having a plurality of longitudinal dovetailed grooves and having two oppositely-disposed recesses near the lower ends of each groove, a plurality of segmental plates mounted on said core, each having a longitudinal dovetailed rib projecting from its inner face, having a transverse key-receiving recess, a pair of keys contained in said recess whichproject laterally from the opposite sides of said rib, and enter the recesses in the core, and a passage through said rib communicating with the transverse key-receiving recess for the introduction and removal of said keys, substantially as described.

5. A grinding or crushing head comprising a core having a plurality of longitudinal dovetailed grooves extending from the bottom to a point near the top, and a corresponding-number of segmental plates, each plate having a dovetailed rib adapted to entera groove in the core and abut against the upper end thereof, a locking device for each plate and a tapering gib placed in each groove in the core at one side of the rib, the upper end of which is made widest and abuts against the upper end of the groove and the lower end of which terminates above the locking device, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

VOLNEY NV. MASON, JR.

\Vitnesses:

B. J. NOYES, H. B. DAVIS. 

